求值:(1+tan23度)(1+tan22度)~(要求详细的回答)?
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(1+tan23°)(1+tan22°)
=1+ tan22°+ tan23°+ tan23°tan22°
=1+tan(22°+23°)×(1- tan22°tan23°)+ tan23°tan22°
=1+1- tan22°tan23°+ tan22°tan23°
=2,10,tan45=tan(22+23)=(tan22+tan23)/(1-tan22tan23)=1
tan22+tan23=1-tan22tan23
(1+tan23度)(1+tan22度)=1+tan23*tan22+(tan23+tan22)
=2,0,
=1+ tan22°+ tan23°+ tan23°tan22°
=1+tan(22°+23°)×(1- tan22°tan23°)+ tan23°tan22°
=1+1- tan22°tan23°+ tan22°tan23°
=2,10,tan45=tan(22+23)=(tan22+tan23)/(1-tan22tan23)=1
tan22+tan23=1-tan22tan23
(1+tan23度)(1+tan22度)=1+tan23*tan22+(tan23+tan22)
=2,0,
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